Processing and Evaluation of Advanced Polymers and Molecular Composites

摘要-Jenekhe高级聚合物，如芳香族聚酰亚胺、芳香族聚酰胺、多喹啉、聚苯并双唑、梯形聚合物和共轭聚合物，在高性能技术应用中具有重要意义，包括工程结构、飞机、航空航天和其他运输工具、电子、光子学和用于有效分离过程的耐热膜，具有刚性的链结构和强烈的分子间相互作用，使得它们的加工和制造成为产品或设备的困难和经济成本。这项实验研究计划的目标是开发新的通用方法，将先进的聚合物和聚合物基复合材料加工和高效制造成一系列行业生产的有用产品。在以前的实验中，等电点发现了一些刚性链聚合物的可逆Lewis酸配位络合化学。一旦形成硬链聚合物的路易斯酸(如AlCl3、FeCl3或GaCl3)络合物，它们很容易溶解在有机溶剂中，浓度达到足够高的浓度，从而在溶液中形成液晶相。当用水或酒精处理时，聚合物络合物也会发生容易的解离，沉淀或再生纯净的原始聚合物。这种杂环刚性链聚合物的可逆Lewis酸碱络合化学可以作为不同聚合物通过传统的有机溶剂加工技术对薄膜、纤维和涂料进行溶液加工的基础。该项目的具体目标包括：(1)确定刚性链聚合物和刚性链/柔性链分子复合材料的基本加工特性，并开发用于从刚性链聚合物的配位络合物的溶液、凝胶或熔体制备薄膜、涂层、纤维或片材的络合中介加工；(2)探索先进聚合物和聚合物复合材料加工的工程问题，开发用于商业加工技术的络合中介加工方法，如旋涂、薄膜挤出和纤维纺丝；以及(3)通过这种加工方法产生的薄膜、涂层、纤维和其他形式的形态和物理性能的评估，从而阐明加工和形态对先进聚合物和聚合物复合材料的机械、电子、光学和光电性能的影响。

Abstract - Jenekhe Advanced polymers, such as aromatic polyimides, aromatic polyamides, polyquinolines, polybenzobisazoles, ladder polymers, and conjugated polymers, of interest for high-performance technological applications including engineering structures, aircraft, aerospace, and other transportation vehicles, electronics, photonics, and heat-resistant membranes for efficient separation processes, have rigid-chain structures and strong intermolecular interactions that make their processing and manufacturing into products or devices difficult and economically costly. The goal of this experimental research program is to develop new generic approaches for the processing and efficient manufacturing of advanced polymers and polymer-based composite materials into useful products produced by a range of industries. In previous experiments, the PI discovered a reversible Lewis acid coordination complexation chemistry of some rigid-chain polymers. Once the Lewis acid (e.g. AlCl3, FeCl3, or GaCl3) complexes of the rigid-chain polymers are formed, they readily dissolve in organic solvents to sufficiently high concentrations as to form liquid crystalline phases in solution. The polymer complexes also undergo a facile decomplexation when treated with water or alcohol, precipitating or regenerating the pure original polymers. This reversible Lewis acid-base complexation chemistry of heterocyclic rigid-chain polymers can be used as a basis of solution processing of different polymers to thin films, fibers, and coatings via conventional organic solvent processing techniques. The project's specific aims include: (1) determination of the fundamental processing characteristics of rigid-chain polymers and rigid-chain/flexible-chain molecular composites and development of the complexation mediated processing for producing films, coatings, fibers, or sheets from solutions, gels, or melts of coordination complexes of rigid-chain polymers; (2) exploration of the engineering problems associated with the processing of advanced polymers and polymer composites by developing the complexation mediated processing approach for commercial processing techniques such as spin coating, film extrusion, and fiber spinning; and (3) evaluation of the morphology and physical properties of films, coatings, fibers, and other forms produced by this processing approach and thereby elucidation of the effects of processing and morphology on the mechanical, electronic, optical, and optoelectronic properties of advanced polymers and polymer composites.